<?php
	/**
	 * Created by PhpStorm.
	 * User: mybook-lhp
	 * Date: 18/3/27
	 * Time: 下午2:34
	 */

	namespace App\Utility;


	class Sum
	{
		private static $instance;

		static function getInstance(...$args)
		{
			if (!isset(self::$instance)) {
				self::$instance = new static(...$args);
			}
			return self::$instance;
		}
	}